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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d6c9ef680c7f755bf7ffe84417be0af5b17fe51cad24feb8c88d84769b3c921' 
  AND token = 'vrLtyiI63knRm3q3CLTrd0nxf67wptFbn03zi2JqLrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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