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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd75ccc6a5d4ba63d551069317f4f41dd156e06638653448d69b8ebf7b1023ec' 
  AND token = 'oajpnUAjftS8/iARAVgrdgdT4SRR5I9Izhf0OeB1fOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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