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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb7fb0ec3eaf9cc5f95f1346535c851bf1fc6f060fa892a858c84ac5160cb196' 
  AND token = 'ko0P/JGyiO2uI/z8zVcvVyIErlf4KLuVm89UuRB9ZWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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