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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '295d9c93e3cd4c2a3e26cdb10ac60957397c68c7a6e7acebc035eee5c4fb018a' 
  AND token = '9PL+ZQaW2eX2++EvY+EeqX9cegqoRrmDxMhMWzT8S+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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