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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9956b279525c46bb3fc82b4d88ab5d73be74970ff799832ae4fb08f7b60bfa3f' 
  AND token = 'qURCwCAoSGFEQ7IG64O5xfbQsCpOGjZKubWcsT24mxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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