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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c12256113aa4d3899aa588b52c48b948d2f0e4a2ad4d6170d492161798ed060f' 
  AND token = '9vLLal0jmfaP2kQdgq13FdDYrS7qzxUZSiSy1Iuz6v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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