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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db5e1ed23573c6171e7f117b21e0cf43f2643a330fafa3eeb4ca799a16f709c1' 
  AND token = 'EbEypKNkxavwGJSdwZtkaOY6H3Qk/K9713SsYMetlqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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