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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e6eaf64696a55a921d356ba6aabff82b0e8f29bc7c4eee473c62e84faec5b0f' 
  AND token = 'llKNLGD74t8tPkbaLfBpSa0ilsZ/YrqAwgCSNdLmFEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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