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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb03e706979de9731b8e1c607c7c4a17ed2ce5ecb4d330fe13d2ce5461c87076' 
  AND token = 'B5KOxRaUXQFvQrAfBha3ntQ/VMUbtHrAV+3810lkDWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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