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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a85703e67873f2c6878d0ec2be0c8d40f25a0d89a4879c99360f815a30cef2ce' 
  AND token = 'f5Y8LiD/dAztoB2+DHvo0VSpd8oqg8sqWsYuAmQnS1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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