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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06f5b68e7773cfba8300f02910d91a88bdefa58e84998149fca6f126e0bde92c' 
  AND token = 'Gv23zJ3epoU037hFVP7nzubbJPxal6p5ORea3PjQXKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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