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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc489c3e9054cef2b6dd825f68d0211dad8cedadbd782df66cf644be3289c1ff' 
  AND token = 'yozgkxdZIF0NPOD8B6J7kkJYNjurS3aEVSMDy0GphAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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