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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79d63cf1f7cbd6531b3c62d0dbe21a75197bd3aefd30e3b457e10bb8874c522e' 
  AND token = '8Sq/HAzeEHmxTJQFzl40NHq4zH/Nno8L0H0nP1lj8dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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