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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad8a7774bdda54d7f529f39227325bce6abdf860a54a6256b87b7f88a7e1c043' 
  AND token = 'f9FLHaOwISoxIDWNJS5b6xx7L5UFCq4DOXR2Y+ezOIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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