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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08e0bd83bce4a3e785b46c7e295f0aa86e7cc4a42e315357d2e95758c034906c' 
  AND token = 'V6Hf8jUssFBUNYtx4tSxcLiTgZzSn9yHdQxZ1zVVM+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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