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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a9c7608c250400368863e7770c88ff45abdfe5266d4c8d90c31229f94e696ae' 
  AND token = '8Iq4ihk6jpmYwcTHlmBoNMZL/exlAlHQ3pz1S6ZZEiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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