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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6a5d2c4329d7769cfb094d06e5cccde2b3a7beb376bc9f0bd4dfdd38f60b68e' 
  AND token = 'L9KZVDeRUurRBoxf456SYydF5AtGnUfBZp6wPE7h6Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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