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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffa468c762282c51b3f1280247c0efc388e8d435cb028fcdb5b55b98a3f8cc4c' 
  AND token = '3OU9Kjh/JNg6b5dcp8UQU/0Qb6E4r6YX/qhUSnp4EZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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