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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ade996028c39cb3c62465cdfa7ca86762daeab62388f7bccfc8411d0d3533e0' 
  AND token = 'UL8I2G61gEakz8owAAdqNcVdB2W2pqbd7HKNSLKCOso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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