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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c5076893295f5627ee5ff8585f1734f2f04b4794c11cd877a9df6730a1526b8' 
  AND token = '3IjmE1oN97svOd78Z8VN7s7Md220gc062EfZ5Quekh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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