SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d6bc719aa85cb29a9eb5ba477cd852d5b7959413ba753d557f25828455bc1ec' 
  AND token = 'BU2vMXpZ9K0/xC4PgpB+3dHjJTb9vgSMcenuwO3UG0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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