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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f64d63c30f7abb123dcdb8ffd3835a9ec60ccf106db019a1558592bef16c4056' 
  AND token = 'xuTh6JN3ffZo21QyxziOt0I7UdTJ6mgPknAJ19DfCDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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