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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '044f19f67904d17b4a26d4aa720d84352ecfebf63d29d04f131c20f5bd1c09d8' 
  AND token = 'ZB5A4zxI1mxK7+Yc62PTwSf1obZVL34xz10uSBsmc98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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