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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64f7f3da3176ea7e5a2a76f8a24d6e943f2afd410a3502a19e1b4cb6c2dbd69c' 
  AND token = '4MqTY5dIt5ojNOweubaADLWlXMK4lPa263W3G1MBfmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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