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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d704cc03178d143d699df3c69205f6a04113d558134c098a47c4535f2348c12' 
  AND token = '6OV0h3fGVKPTBNZ56NP2pkuzGeZpi2MRDu31m+gK51M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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