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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a27c1645fa559e507085fd0e3ba19699f8f1c294b14dc71131ffd5d35a74bd1b' 
  AND token = 'poxlcMvJkiPMIM07VG01RAyoOomaoThcGdOWRHb4RaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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