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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b72c80dc8a1062f913219fb9aefba750075eb3f30d01da120559f0298fddfa0' 
  AND token = 'NblZygUnuZ+CuffLkUaH+jfGE1VmoPvW2vVsZRTyMB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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