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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01562cb375075a45b5a343110644f7d82e0f1b94fb049ab4ee1f240afaed064c' 
  AND token = 'MMp8H+p63caOngKa+4/QzLQR3ZEH16spSOpkUiTTVv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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