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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb1db0a5900400b9ae58da4b3ee777688dadb7ce2e0b0c4a2b95c03543811965' 
  AND token = 'o3rggXxiF1FxrML4CgqDypfTyL3xoZiRGSOKrZgNMHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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