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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cafde0620bef51b71bd19c97bff12a0695fa95358c074b75b70c6299c4fddbd7' 
  AND token = '0T+OMFIBaEwy6LysJMsz/ervpWJdwPdaOs37qPwBpJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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