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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '208ecc2aa956e7250c0cc598378eb4facc72cd977b1b5c68d6d6492d7cfec06e' 
  AND token = '2hbN0ZbYL5KoWQYkQSZDiLK2rYG+CFHQjR1y4E9cD5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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