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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d8c07583e5e4ba10430fc9ea83582ed659d181226559a2c1d5fd0a844c5a84a' 
  AND token = '1JUhFuCEe0r5pgS/98pYOigQKysiCygQcwVUVghjlGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00299

JSON explain

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