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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0bcd80f1ad5de65fac7f861cdfb283395fe3fe41e388a7a68d5ddd15e1686b0' 
  AND token = '5xEFoY895/9D3Ag5ysZMWzP0ps7XcQSgwxkIZxbwH20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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