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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ca316f7ca5ad2befa62cabb39cb8d106852a25dcf547a659700c76a9904dfba' 
  AND token = 'DGXFsREL/u1h24TDkpEE3V/yC9deVM0wLOxSJoYy1I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}