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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a614d33e6e3773d751370172c885a2e93dd695f6130b31453a263e512a2983ad' 
  AND token = 'A8jdDeX1K2ylcI08hma9fnbPTAfkbqfAZwe0WJPwqqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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