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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c3c17eaf7910c474e182abe38ec2c6b4324fdb87d81d5109738a4fc43e62062' 
  AND token = 'mQsW6cHf1rc8Qc3JZ2KWdTs2fujEuoBgLvUPTr6z5+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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