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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '837a973074d3abb41c8fc1e8e255a5de4bcbe1a84f2a535dae450edf704ecf53' 
  AND token = 'WwOfRXGHO/OMlhbjwoWuP3w9SPc4FwOce/Tqay+Z3H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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