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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18dfeac42b5d456eea58f09c34b89224c6a2afa2cb1b4c1c5abc4ee58df9fda0' 
  AND token = 'PTxt+DJcHgCawi5dFK5CJx2zkXIXW2BeX0gsA/DwF38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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