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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d6b015e7a9928aafaf50ef21d4a1c9cf3186aa983c6279faee7568b61aec985' 
  AND token = 'pDDbEZi4bW5cUlNpKd7I6C7CvkkY/e8CRkSGHUpuJF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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