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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8f4bc810827e132620231edde81402cda5cfd4380c9651fb05c9b2ab4820a4a' 
  AND token = 'j8y2abE4tRSCvYQYzoDur4Usw5hU8QG/1UyL9je6kaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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